The story of Buddha is clear. How did he reach his enlightenment? what was the main force that drove him to head down the path?
The main force that drove him was a realization of suffering, and the core of his teachings was an understanding of the nature of suffering. "Enlightenment" in the Buddhist tradition may or may not bear any resemblance to whatever Ueshiba called "enlightenment". The term is commonly bandied about in the west and used for different things. I don't think there's necessarily any commonality there.